I have recently ripped up carpet and padding on a cement floor for a sixth floor condo unit. I plan on installing 3/4" Bella, 3' wide flooring on it. The problem is that there is a ridge running the length of the room in the cement floor that will buckle the planks if left unaddressed. 

What (if any) methods are there for smoothing this ridge?

**Edit: I believe the floors are precast concrete slabs and looks like one slab is a little off level, or it settled a bit, thus this ridge.
Maybe another way to ask this - Is there a way to compensate for the slight off levelness as it runs about 20'? The rest of the floor slabs are level with each other.**